[deliverable/linux.git] / fs / xfs / xfs_ialloc_btree.h

/*
 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_IALLOC_BTREE_H__
#define	__XFS_IALLOC_BTREE_H__

/*
 * Inode map on-disk structures
 */

struct xfs_buf;
struct xfs_btree_cur;
struct xfs_mount;

/*
 * There is a btree for the inode map per allocation group.
 */
#define	XFS_IBT_MAGIC	0x49414254	/* 'IABT' */

typedef	__uint64_t	xfs_inofree_t;
#define	XFS_INODES_PER_CHUNK	(NBBY * sizeof(xfs_inofree_t))
#define	XFS_INODES_PER_CHUNK_LOG	(XFS_NBBYLOG + 3)
#define	XFS_INOBT_ALL_FREE	((xfs_inofree_t)-1)

static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
{
	return (((n) >= XFS_INODES_PER_CHUNK ? \
		(xfs_inofree_t)0 : ((xfs_inofree_t)1 << (n))) - 1) << (i);
}

/*
 * Data record structure
 */
typedef struct xfs_inobt_rec {
	__be32		ir_startino;	/* starting inode number */
	__be32		ir_freecount;	/* count of free inodes (set bits) */
	__be64		ir_free;	/* free inode mask */
} xfs_inobt_rec_t;

typedef struct xfs_inobt_rec_incore {
	xfs_agino_t	ir_startino;	/* starting inode number */
	__int32_t	ir_freecount;	/* count of free inodes (set bits) */
	xfs_inofree_t	ir_free;	/* free inode mask */
} xfs_inobt_rec_incore_t;


/*
 * Key structure
 */
typedef struct xfs_inobt_key {
	__be32		ir_startino;	/* starting inode number */
} xfs_inobt_key_t;

/* btree pointer type */
typedef __be32 xfs_inobt_ptr_t;

/*
 * Bit manipulations for ir_free.
 */
#define	XFS_INOBT_MASK(i)		((xfs_inofree_t)1 << (i))
#define	XFS_INOBT_IS_FREE(rp,i)		\
		(((rp)->ir_free & XFS_INOBT_MASK(i)) != 0)
#define	XFS_INOBT_SET_FREE(rp,i)	((rp)->ir_free |= XFS_INOBT_MASK(i))
#define	XFS_INOBT_CLR_FREE(rp,i)	((rp)->ir_free &= ~XFS_INOBT_MASK(i))

/*
 * Maximum number of inode btree levels.
 */
#define	XFS_IN_MAXLEVELS(mp)		((mp)->m_in_maxlevels)

/*
 * block numbers in the AG.
 */
#define	XFS_IBT_BLOCK(mp)		((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
#define	XFS_PREALLOC_BLOCKS(mp)		((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))

/*
 * Btree block header size depends on a superblock flag.
 *
 * (not quite yet, but soon)
 */
#define XFS_INOBT_BLOCK_LEN(mp)	XFS_BTREE_SBLOCK_LEN

/*
 * Record, key, and pointer address macros for btree blocks.
 *
 * (note that some of these may appear unused, but they are used in userspace)
 */
#define XFS_INOBT_REC_ADDR(mp, block, index) \
	((xfs_inobt_rec_t *) \
		((char *)(block) + \
		 XFS_INOBT_BLOCK_LEN(mp) + \
		 (((index) - 1) * sizeof(xfs_inobt_rec_t))))

#define XFS_INOBT_KEY_ADDR(mp, block, index) \
	((xfs_inobt_key_t *) \
		((char *)(block) + \
		 XFS_INOBT_BLOCK_LEN(mp) + \
		 ((index) - 1) * sizeof(xfs_inobt_key_t)))

#define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \
	((xfs_inobt_ptr_t *) \
		((char *)(block) + \
		 XFS_INOBT_BLOCK_LEN(mp) + \
		 (maxrecs) * sizeof(xfs_inobt_key_t) + \
		 ((index) - 1) * sizeof(xfs_inobt_ptr_t)))

extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *,
		struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t);
extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int);

#endif	/* __XFS_IALLOC_BTREE_H__ */
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000,2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1da177e4	13	*
7b718769 NS	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4 LT	17	*/
	18	#ifndef __XFS_IALLOC_BTREE_H__
	19	#define __XFS_IALLOC_BTREE_H__
	20
	21	/*
	22	* Inode map on-disk structures
	23	*/
	24
	25	struct xfs_buf;
	26	struct xfs_btree_cur;
1da177e4 LT	27	struct xfs_mount;
	28
	29	/*
	30	* There is a btree for the inode map per allocation group.
	31	*/
	32	#define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
	33
	34	typedef __uint64_t xfs_inofree_t;
	35	#define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
	36	#define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
	37	#define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
	38
a844f451 NS	39	static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
	40	{
	41	return (((n) >= XFS_INODES_PER_CHUNK ? \
	42	(xfs_inofree_t)0 : ((xfs_inofree_t)1 << (n))) - 1) << (i);
	43	}
1da177e4 LT	44
	45	/*
	46	* Data record structure
	47	*/
61a25848 CH	48	typedef struct xfs_inobt_rec {
	49	__be32 ir_startino; /* starting inode number */
	50	__be32 ir_freecount; /* count of free inodes (set bits) */
	51	__be64 ir_free; /* free inode mask */
	52	} xfs_inobt_rec_t;
	53
	54	typedef struct xfs_inobt_rec_incore {
1da177e4 LT	55	xfs_agino_t ir_startino; /* starting inode number */
	56	__int32_t ir_freecount; /* count of free inodes (set bits) */
	57	xfs_inofree_t ir_free; /* free inode mask */
61a25848 CH	58	} xfs_inobt_rec_incore_t;
61a25848 CH	59
1da177e4 LT	60
	61	/*
	62	* Key structure
	63	*/
61a25848 CH	64	typedef struct xfs_inobt_key {
61a25848 CH	65	__be32 ir_startino; /* starting inode number */
1da177e4 LT	66	} xfs_inobt_key_t;
1da177e4 LT	67
16259e7d CH	68	/* btree pointer type */
	69	typedef __be32 xfs_inobt_ptr_t;
	70
1da177e4 LT	71	/*
	72	* Bit manipulations for ir_free.
	73	*/
1da177e4	74	#define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
a844f451 NS	75	#define XFS_INOBT_IS_FREE(rp,i) \
a844f451 NS	76	(((rp)->ir_free & XFS_INOBT_MASK(i)) != 0)
1da177e4	77	#define XFS_INOBT_SET_FREE(rp,i) ((rp)->ir_free \|= XFS_INOBT_MASK(i))
1da177e4	78	#define XFS_INOBT_CLR_FREE(rp,i) ((rp)->ir_free &= ~XFS_INOBT_MASK(i))
1da177e4	79
1da177e4 LT	80	/*
	81	* Maximum number of inode btree levels.
	82	*/
1da177e4	83	#define XFS_IN_MAXLEVELS(mp) ((mp)->m_in_maxlevels)
1da177e4 LT	84
	85	/*
	86	* block numbers in the AG.
	87	*/
a844f451 NS	88	#define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
a844f451 NS	89	#define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
1da177e4	90
7cc95a82 CH	91	/*
	92	* Btree block header size depends on a superblock flag.
	93	*
	94	* (not quite yet, but soon)
	95	*/
	96	#define XFS_INOBT_BLOCK_LEN(mp) XFS_BTREE_SBLOCK_LEN
	97
1da177e4 LT	98	/*
1da177e4 LT	99	* Record, key, and pointer address macros for btree blocks.
136341b4 CH	100	*
136341b4 CH	101	* (note that some of these may appear unused, but they are used in userspace)
1da177e4	102	*/
136341b4 CH	103	#define XFS_INOBT_REC_ADDR(mp, block, index) \
	104	((xfs_inobt_rec_t *) \
	105	((char *)(block) + \
7cc95a82	106	XFS_INOBT_BLOCK_LEN(mp) + \
136341b4 CH	107	(((index) - 1) * sizeof(xfs_inobt_rec_t))))
	108
	109	#define XFS_INOBT_KEY_ADDR(mp, block, index) \
	110	((xfs_inobt_key_t *) \
	111	((char *)(block) + \
7cc95a82	112	XFS_INOBT_BLOCK_LEN(mp) + \
136341b4 CH	113	((index) - 1) * sizeof(xfs_inobt_key_t)))
	114
	115	#define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \
	116	((xfs_inobt_ptr_t *) \
	117	((char *)(block) + \
7cc95a82	118	XFS_INOBT_BLOCK_LEN(mp) + \
136341b4 CH	119	(maxrecs) * sizeof(xfs_inobt_key_t) + \
136341b4 CH	120	((index) - 1) * sizeof(xfs_inobt_ptr_t)))
1da177e4	121
561f7d17 CH	122	extern struct xfs_btree_cur xfs_inobt_init_cursor(struct xfs_mount ,
561f7d17 CH	123	struct xfs_trans , struct xfs_buf , xfs_agnumber_t);
60197e8d	124	extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int);
561f7d17	125
1da177e4	126	#endif /* __XFS_IALLOC_BTREE_H__ */